Peace Love Rock!
Danielle Warn
What is a Rock?
A Rock is composed of Mineral which contain crystals, a rock is defined by their texture and where it originated.
Igneous
- Form outside or inside a volcano
- They are made from harden magma
- Extrusive and intrusive
Metamorphic
- Heat and Pressure
- Mountains, oceans etc...
- Foliated and Nonfoliated
Sedimentary
- when sediments are compacted and cemented together
- On earth's surface
- Inorganic, Organic and Chemically
Examples
Andesite
- Formed Extrusive, fast cooling so the crystals are smaller
- Fine & less then 1mm
- Nonvesicular
- In the middle between light and dark
- 25% Amphibole 15% Biotite and 60% orthocrase
Siltstone
- Inorganically formed
- quartz, feldspar and clay minerals may contain fragments of other rocks and minerals
- very fined grained
Hornfels
- nonfoliated
- fine grained
- various minerals
- contact with heat
- various rocks changed by heat from nearby magma/lava
The Rock Cycle
Model showing how rocks and sediments change over time